Green Eyes. Green eye color is often confused with hazel eye color, yet is entirely separate and distinct. Green eye color is the rarest color found around the world, and it is estimated that only around 2% of the world's population has green colored eyes.
Besides, why do people's eyes change color from blue to green?
When the pupil size changes, the pigments in the iris compress or spread apart, changing the eye color a bit. Certain emotions can change both the pupil size and the iris color. That's why some people say their eyes change colors when they're angry or loving. However, some hazel eyes actually get darker with age.
Are green eyes the only eyes that change color?
Factors That Can Slightly Alter Green Eye Color. Because of this, changes in the light being scattered by the iris of lighter colored eyes will change the apparent color of the eyes. This results in "chameleon eyes", or eyes that change color. They fall into the amber, hazel, green, grey, and blue range.
Are GREY eyes really blue?
Grey eyes are a curious case, and extremely rare. Grey eyes are similar to blue in that they contain no melanin, but they do contain excess collagen deposits in the stroma that interfere with Tyndall scattering, blocking the appearance of blue hues. (That's the current theory anyway).